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238T Metal-over-Metal Roof Recover Systems

238T Metal-over-Metal Roof Recover Systems

McElroy Metal has develop several methods to recover an existing metal roof using the symmetrical 238T standing seam roof system. Available systems include a patented, frame-less Metal-Over-Metal recover option that provides a low cost retrofit solution over existing exposed fastened panels with ribs up to 1.5 inches tall.  238T recover systems provide a long-term solution to existing exposed fastened metal roofs that have completed their service life at a cost that is competitive with single-ply recover and will last two (2) to four (4) times longer. 

Recent articles and white papers have been published to inform and educate the marketplace about critical engineering considerations that must be made when considering single-ply recover over an existing metal roof.

Comparison of Retrofit Systems Over Existing Metal Roofs

Recovering Existing Roof Systems

Single-Ply Roofs Over Metal

Recover Your Roof! Video 

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Installation over Exposed Fastener Panels

The thru-fastened recover system is designed to be installed over existing panels up to 1.5" tall, such as R-Panel. The system utilizes tall clips that sit between the ribs of the existing panel and are attached directly to the purlin below. The air space between the two roofs is filled with insulation. 

Additional Information

McElroy Metal frame-less recover systems provide the following benefits:

  • Panels can be manufactured up to 24" wide, onsite, directly onto the roof to eliminate end laps and improve
    installation efficiency
  • Extremely high wind-uplift capacity when attached to purlins 5' o.c., which means no additional corner/edge framing
  • Individual panel removal and replacement capabilities which allows for easier repairs at a later date
  • Very little disruption to building occupant
  • Increase wind uplift capacity of existing roof without additional framing
  • Very little trash/landfill debris generated
  • Decades long service life
  • Direct attachment to the structure without expensive sub-framing
  • Extremely fast installation
  • Up to 100 psf snow load without additional framing
  • Structural diaphragm is not altered

Shown below are the steps of a 238T Metal-Over-Metal recover installation. 

Utilizing McElroy's jobsite production vehicles, roof panels run from eave to ridge, eliminating the need for end laps.
Single length panels offer labor savings and improve weathertightness.

Once the panels are manufactured on the roof, then special die-cut insulation is placed over the existing roof panels.

  • Clips are attached to the structure
  • Insulation is installed between the clips
  • 238T panels are placed on top of the insulation
  • 238T panels are joined together using 238T seam caps 
    and mechanical seamer

Seam caps are applied over adjoining 238T panels.

Note the two beads of butyl sealant in the seam cap that improves weathertightness.

For maximum strength and load handling capabilities, Multi-Span clips can run from eave to ridge as shown on the left. Multi-Span clips are often utilized in critical areas, such as corners, while standard clips are utilized for the majority of the roof. 

For high wind uplift or snow load area, McElroy's Multi-Span clip provides up to -93.5 psf allowable uplift or nearly 100 psf positive with a 24" wide panel installed over purlins 5' on center.

Related Files


CAD Drawings

PDF Drawings


Metal Panel Care & Maintenance

Product & Trim Information Books

Installation Manuals

Retrofit & Recover Systems

Product Approval Report / Miami-Dade Notice of Acceptance (NOA)

Product Approval Report / ICC-ES Approvals

Technical Bulletins / Miscellaneous Testing

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General Product and Warranty Information

Panel Load Tables w/Section Properties and Testing

Safety Data and Material Safety Data Sheets


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Weathertightness Warranties

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Find a Distributor/Contractor Near You

Whether you’re building a new home or planning renovations, a metal roof can deliver long-term cost savings and comfort. To explore your options and find the product that meets your aesthetic and budgetary needs, contact a McElroy Metal distributor or contractor in your area today. We can’t wait to help make your dream home a reality.

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